Ever thought about building your own portable DAW? IMO, the components that are on the market now-a-days are equal if not better than what you'll find in any commercial setup. I've housed my setup in a rack server case which can be used for future upgrading. This is the route I'll take for my next project. With such a setup, you'll find it'll work with a decent 20 space rack or whatever suits your taste and maybe 2 decent sound cards. Also within this setup you can have a seperate dedicated backup system. I don't see why such a setup should'nt be within your means. PS, count in a power backup system too, rackmountable would be the thing to go with of course.